Respiratory mask.



.1: ES A. FURTAW, OF PHILADELPHIA, PENE'SYLVANIA.

'RESPIRATORY MASK.

anemia.

Application lerl January 21, 1914. Serial No. 813,352.

tion being to provide a mask which may be comfortably worn, and whichwill insure a' supply of pure dust filtered air, so that Work may b'ereadily done'under trying conditions which now prove dangerous toworkmen.

A. further object is to provide'a maskv of the character stated in whichan improved arrangement of valves is provided, allowing free respirationand insuring an escape of air exhaled from the lungs, supplying freshair for inhalation.

A. further object is to provide improved means for supplying air in afiltered condition either under normal atmospheric conditions or underpressure as desired.

With these and other objects in view, the invention consists incertainnovel `features of construction and combinations and arrangements,of parts as will'be more-fully hereinafter described and pointed out inthe claims.

'In the accompanying drawings: Figure 1 is a view in side elevationillustrating my improvements. Fig.,2 is a view in vertical longitudinalsection through the mask. Fig.

3 is a fragmentary view in horizontal nsection on the line 3-3of Fig. 2.Fig. 4 1s a similar view in section on the line Ll-4 of lTig. 2, andFig. 5 is a view in longitudinal section through the center of the'airfiltering chamber taken on the line 5- 5 of Fig. 1, but omitting thehose connection.

' My improved mask- 1 is composed in the main of leather having atransparent sec*v tion 2, through which the user may readily observe thesurroundings.V The mask l, or at least the face portion thereof, isoutlined throughout its edge on its inner surface with relatively heavyfelt 3 so as to snugly fit the face and render the mask substantiallyair tight.

Canvas sections Llare secured to the mask and are connected by suitablestraps 5 at the back of the head to hold the mask in place'. The mask atits front is provided with a screenedroutlet 6 which is located at theouter Specification of Letters Patent.

pend of an inwardly projecting? tube 7, the

latter having its inner end located at en angle and provided with a flapvalve 9 preferably of leather. This valve 9 is secured at Patentes reas,as

its upper edge, and isl free to swing in@ wardly, the inward movement ofthe 'valve limited by an internal flange 10 on the inner end of the tube7 which serves to seat the valve y and prevent any entrance of airthrough the tube.

The tube. 7 and the screen 6 are secured to metal plates-11 and-12, andthe latter are secu'red'to the leather oil' the mask by rivets 13,

the mask being cut out to accormnodate the parts, whisk iso course to beunderstood.

The llower er chin portion of the mask is' provided with an inlet nipple14; having a flap valve 15 at its upper end, scanned to the bottomlportion of. thel mask as shown at i6 and free toy swing' upwardly toallinvl an entrace of air through the nipple.

17 represents an air filtering tank which is: preferably secured aroundthe waist of the user by means of a strap-18. This air ltering tank iselongated and comprises,

telescopic sections 19 and 2O which clamp between them a sheet 21 ofwoven material. This sheet may be readily replaced by separating thesections.

The bottom of the lower telescoping section 2O is closed by a wirescreen 22, and a nipple 23 is provided in the top of upper section 19which is connected by a hose 24 withnipple 14, so that air which isdrawn into the mask is drawn through the wire mesh screen 22, andthrough thesheet 21.

The screen 22 excludes the larger particles ofdust, while the sheet 21holds back the smaller particles, and hence the air passing to the maskis thoroughly filtered.

At one end of the upper section 19 ot' tank 17, I provide an inlet 25Vnormally closed by a plug 26. This inlet is adapted to be connected bya hose with-any air supply device, so that if desired, air underpressure may be supplied to the mask. 'i

By the arrangement of parts above described, if the pressure of air isexcessive, and more than desired, it will escape past the valves 15 and9, and through the screened outlet 6 and also will pass downward iythrough the screened bottom 22 of tank 17.

In-operation, the air inhaled is drawn upwardly through the filteringtank 17 and hose. 24 ast valve 15. Air exhaled is forced outwar y pastvalve 9 through screened eieeeee e inhalation causes valve 9 to closeand valve l5 @to lopen, and exhalaeion causes Valve l5 eociose ami vaive9 to open. The valves therefore operate automaticay and eompei oui airWhieh has been exhaled eo escape and eiways permit, and in feet compei,ehe operator to oreath' fresh air coninuously 7 Ey reason 'of thearrangement o' parte above described, the user may breathe through themouth or nose, or both, and the deviee wil operate, Withequal facility,

v Various -siight changes might be made in *ehe geneiai form anderianvement of parte desei'ibedwithout departing from my in'- venzion,and hence do not lmi myse to she precise details set orh, but considermyself at iberty o make sueh changes and altera'zioiis es fairly failWithin ehe spirii and, scope of the appended chime.

Having thus described my inventiomwhat daim es new and desire to seeuieby Letters Potent; is: y

l. A respiratory mask constructed to t the face and having a screenedoutlet in its opening 6.

A from, an inwardympojeeting tube comunm-y iiieeting Wich the outlet andhaving its inner end ein an angie te its longitudinal axis, e veve ai;the muet emi of ehe tube permitting the 'ow of ein outwercy throughfe'ftu'be, Seidl mask having en iigle in iis lewe? emi, end e a@ valvepermitting ehe Eme' ef aie into' the mask throiigh seid net, eeeeutieliyas cie/scribed.

, 2 A zfespiracory mask of e shape @o the ieeey and having elineg ofsoit meteriei' 1550 bear againstthe face, .means oe ehe mask forclamping the same efmmd the heed o the user, said mask having openingsin ies from v and lower end, meia'l piaes secured te the inner and outersurfaces o the mask emi having a. screen therein located ever theopening in the :from of the mask, e'uoe se cured to the inner metalpieta and heaving its imieif end et en angle to 'its longitudinal exis,a Hap valve in the tube :normally eiosing the inner end of the tube, :ma, ep valve normay closing the opening in the heiem of the mask,substenizieiiy es described. l a

n testimony whereofl have sgiie my name to this specification in thepresence o 4 two subscribing Witnesses,

CHARLES e.. ieeeiew.

Witnesses:

CHAS. E. Powe, M, E. Dimes.

